<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表单下拉框示例</title>
</head>

<body>
    <!-- 表单下拉框示例 -->
    <form action="/submit_form" method="post">
        <label for="programmingLanguage">选择编程语言：</label>
        <!-- 下拉框 -->
        <select id="programmingLanguage" name="programmingLanguage">
            <option value="java">Java</option>
            <option value="python">Python</option>
            <option value="javascript">JavaScript</option>
            <option value="csharp">C#</option>
        </select>
        <p><input type="submit" value="提交"></p>
    </form>

    <!-- 下拉框 -->
    <select id="programmingLanguage" name="programmingLanguage">
        <option value="java">Java</option>
        <option value="python" selected>Python</option>
        <option value="javascript">JavaScript</option>
        <option value="csharp">C#</option>
    </select>
</body>

</html>